Fog Seals and Rejuvenating Seal Subtask Group Progress Report CO-Chairs John Fox - Caltrans Bob McCrea-Industry A PPTG Partnering Accomplishment April 19, 2005

HistoryHistory  Memorandum Signed By: Bob Coleman Deputy Director Project Development, November 3, 1998  Stop all fog seals and rejuvenating seals by contract item in the traveled way.  Sights the need for guidance to be Developed.

Steps completed for fog seals and rejuvenating seals  The approval of the maintenance technical advisory Guide (MTAG)  Published Chapter 6 independently of the MTAG - Fog Seal and Rejuvenating Seal guidelines  PPTG task group worked with PST to develop Clear SSP language to insure user safety via quality control  Generated Pilot Project with NSSP for Rejuvenating Seals, D-4 Route 29 - December 2004-Being Advertised Now.

SSP Highlights ( Fog Seals)  Fog seal coat shall conform to the provisions in Section 37 ‑ 1, "Seal Coats," of the Standard Specifications and these special provisions.  Asphaltic emulsion shall be either SS1h or CSS1h or CQS1h grade.  The application rate of the fog seal coat (asphaltic emulsion and 40% to 50% added water ) shall be spread at a rate of L/m2.  The exact dilution ratio and rate of application will be determined by the Contractor. Final surface shall produce a surface having a coefficient of friction not less than 0.30 as determined by California Test 342. Tests to determine coefficient of friction will be made before pavement is open to public traffic.  The Contractor shall submit a contingency plan for the approval of the Engineer, which will include corrective action if the coefficient of friction is less then 0.30

SSP Highlights ( Rej.Seals)  5 alternatives Type A,B,C,D and E  The final application rate determined by vendor. SSP provides ranges by type  Final surface shall produce a surface having a coefficient of friction not less than 0.30 as determined by California Test 342.  The Contractor shall submit a contingency plan for the approval of the Engineer, which will include corrective action if the coefficient of friction is less then 0.30

Next Steps  Notify districts regarding guidance. Place SSP’s on OE server.  Develop correlation between other available skid test methods and CT 342. Use CT 342 based on available resources until correlation is complete.  Districts select a limited number of projects and submit to HQ for approval. Based on availability CT 342  Monitor projects

GuidanceGuidance  MTAG & SSP’s has been provided.  Rejuvenating Seal Specification is on the OE server  Fog Seal SSP will go to OE for posting on server.

Correlation with CT 342 needed  Since CT 342 satisfies Caltrans comfort zone, develop a correlation curve with a portable alternate device.

Select Projects  Find Districts that will sponsor a project  Set criteria  Minimum Existing Pavement Skid Number  Initially, Insure that the number of projects match the available testing resources.  Include industry input for prescription.  Follow manufacturer recommendations

Performance Monitoring What?  Skid numbers-Yes  Effect of different fog & rejuvenating seals on various surface textures (e.g. OG, DG, GG, chip seals, slurry seals) & different aged pavements. Yes  Life cycle cost analysis with control sections. Yes  Agency log and documentation. Yes  Pre-existing condition & skid number  Ambient & pavement temperature  Environment - fog, rain, sun  Monitor Agency Table “C” wet accidents  Agency Table C Wet Accidents. Yes

Who Monitors?  Subtask Group will monitor projects  Frequency - semi-annually  Time frame - 3-year minimum  Select specific projects for monitoring  Various geographic areas  Various surfaces  Responsibility for data base. HQ Roadway Maintenance.

Summary Statement: Fog Seals and Rejuvenating Seals are one of the best maintenance tools available for pavement preservation provided they are at done at the right time. These tools provide a huge benefit and now is the time to invest in the future of our highways. Fog Seals and Rejuvenating Seals are one of the best maintenance tools available for pavement preservation provided they are at done at the right time. These tools provide a huge benefit and now is the time to invest in the future of our highways.

Thanks ! John Fox - Caltrans Bob McCrea-Industry